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n1n9-jp/detect_404_before_error

Created March 11, 2022 00:34
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detect_404_before_error
// https://www.finleyghosh.com/blog/check-for-a-page-404-with-only-javascript
function UrlExists(url) {
var http = new XMLHttpRequest();
http.open('HEAD', url, false);
http.send();
if (http.status != 404)
return true;
else
return false;
}
if ( UrlExists(selectedTextPath) ) {
// load external file.
} else {
// don't load.
}
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